12 posts / 0 new
Last post
Re: Hdtv
keith3267 wrote:

There is certainly a misconception about the old interlace standard. A lot of people think that the picture is a 480 line picture transmitted in two parts, that is not true. It was a 240 line picture transmitted twice. The cameras of the period were only able to capture a 240 line picture every 1/30th of a second, but it was transmitted twice in that timeframe to reduce visible flicker on the TV set.

There's a name for the 240-line analogue video transmitted twice... I think they used to call it "industrial sync". In other words, even at the time it was something not adequate for broadcast use, but if you were a factory looking for a camera so that the night watchperson could more easily keep an eye on the place, for that it might do.


Sponsored Stories

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.